Lock mechanism

ABSTRACT

A lock mechanism having a housing in which a bolt is slidably movable, the bolt having one end normally extended for a relatively short distance beyond the housing into a so-called &#39;&#39;&#39;&#39;latching&#39;&#39;&#39;&#39; position. A slidable sensing bar is located alongside of the bolt and it is spring-biased so that it normally projects beyond the housing for a distance co-extensive with the bolt while the bolt is in its latching position. A spring-biased rotor is contained within the housing and it is linked to the bolt so that by its rotative movement it will force the bolt to a projected position for a distance well beyond that of the latching position. The sensing bar carries means for engagement with the rotor for holding the rotor from turning, and when said sensing bar is retracted in opposition to its spring bias, and by its pressure against a striker plate on a door, it will free the rotor and it will permit the turning of the rotor under its spring urge, and by the connection of the rotor to the bolt, it will cause the projection of the bolt to an extent far greater than its latching position and will lock the bolt in such extended position. A locking arrangement between the sensing bar and the rotor maintains the rotor against rotative movement to keep the bolt in its fully projected position until required to be retracted whereby the bolt will be maintained in its advanced position until the bolt is caused to be shifted by key or knob operation. The invention also contemplates a novel mounting means for the lock.

United States Patent [191 Wellekens 1 Mar. 25, 1975 1 1 LOCK MECHANISM [76] Inventor: John F. Wellekens, 51 E. 42nd St.,

New York, NY. 10036 [22] Filed: Dec. 5, 1973 [21] Appl. No.: 421,943

[52] US. Cl 70/370, 70/143, 70/371, 292/167 [51] Int. Cl. E051) 55/00, E05b 9/08 [58] Field of Search 70/143, 368, 370, 371; 292/167, 169.13

[56] References Cited UNITED STATES PATENTS 777,130 12/1904 Noack .1 70/370 1,557,374 10/1925 Soley 70/143 1,761,092 6/1930 Shinn 70/368 3,434,316 3/1969 Neary 70/371 3,526,111 9/1970 Jacobi 70/368 3,621,686 11/1971 Klein 70/157 FOREIGN PATENTS OR APPLICATIONS 466,562 10/1928 Germany 70/143 Primary Examiner-Albert G. Craig, Jr.

[571 ABSTRACT A lock mechanism having a housing in which a bolt is VIIIIIIJ JIIIIIIIII'IIIII slidably movable, the bolt having one end normally extended for a relatively short distance beyond the housing into a so-called latching position. A slidable sensing bar is located alongside of the bolt and it is spring-biased so that it normally projects beyond the housing for a distance co-extensive with the bolt while the bolt is in its latching position. A spring-biased rotor is contained within the housing and it is linked to the bolt so that by its rotative movement it will force the bolt to a projected position for a distance well beyond that of the latching position. The sensing bar carries means for engagement with the rotor for holding the rotor from turning, and when said sensing bar is retracted in opposition to its spring bias, and by its pressure against a striker plate on a door, it will free the rotor and it will permit the turning of the rotor under its spring urge, and by the connection of the rotor to the bolt, it will cause the projection of the bolt to an extent far greater than its latching position and will lock the bolt in such extended position. A locking arrangement between the sensing bar and the rotor maintains the rotor against rotative movement to keep the bolt in its fully projected position until required to be retracted whereby the bolt will be maintained in its advanced position until the bolt is caused to be shifted by key or knob operation. The invention also contemplates a novel mounting means for the lock.

5 Claims, 21 Drawing Figures PAYEHTED 3,872,697

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LOCK MECHANISM The invention relates to lock mechanism and more particularly to mechanism employed in a lock for use upon a door or other closure.

Due to the fact that known types of locks which have a spring-biased bolt, can be easily opened by unauthorized persons, and often by the insertion of a flexible strip between the bolt and its keeper, the user of such locks often finds it desirable or necessary for his protection, to employ an additional lock, and particularly one of the so-called dead bolt" type, on his door. This requires the use of two locks on the door, thus involving the cost of such locks as well as the installation charges.

It is a primary object of the present invention to provide a lock which has incorporated in it all of the features of both a spring-biased lock and a dead bolt type and in which a bolt can be automatically projected, on closing or slamming of a door, to an advanced or projected position, and locked in such position, thereby enabling it while in that position, to effectively serve as a dead bolt and fully perform the function of a second lock.

Other objects of the invention will be apparent from the description set forth hereinafter.

In the accompanying drawings, wherein an illustrative embodiment of the invention is shown,

FIG. 1 is a longitudinal sectional view ofa lock mechanism made in accordance with the invention, the bolt thereof being shown in its fully advanced or so-called dead bolt" position;

FIG. 2 is a similar view showing the bolt in a retracted or latching position;

FIG. 3 is a plan view of the rotor, the head of the sensing bar and the slide which is coupled by a link to the rotor and which slide connects the bolt to the rotor;

FIG. 4 is a cross sectional view through the structure of FIG. 3;

FIG. 5 is a view similar to FIG. 3, and in which the rotor has been moved to bring its lug or stop into abutment a similar lug or stop provided on the head of the sensing bar;

FIG. 6 is a face view of the arcuate coupling link;

FIG. 7 is a view similar to FIGS. 3 and 5, but in which the slide coupled to the bolt has moved to the right to bring the bolt into its extended position;

FIG. 8 is a face view of the head of the sensing bar;

FIG. 9 is a longitudinal sectional view through the bolt and its associated parts;

FIG. 10 is a top plan view of the bolt;

FIG. 11 is a cross sectional view through the bolt and its housing and other parts;

FIG. 12 is a view in a reduced scale, showing the manner in which the bolt is linked to the rotor and showing the relationship of the sensing bar to the rotor;

FIG. 13 is a longitudinal sectional view through a lock containing the improved construction, with particular reference to the key-controlled means for retracting the latch;

FIG. 14 is a face view of the latching cam, the view being taken on the line l4-14 of FIG. 15, looking in the direction of the arrows;

FIG. 15 is a sectional view through the latching cam, the view being taken on the line l515 of FIG. 14, looking in the direction of the arrows;

FIG. 16 is a face view of the side of the cam opposite to that shown in FIG. 14;

FIG. 17 shows the lock, looking at the same from the right of FIG. 13;

FIG. 18 shows how the cam latch acts to become depressed and releases the lock cylinder;

FIG. 19 shows the manner in which oarts of the lock are fitted together;

FIG. 20 shows how the cup-shaped casing is attached to the face plate, and

FIG. 21 is a view of the cup-shaped casing as indicated by the line 2l-21 in FIG. 20 and looking in the direction of the arrows.

Referring to the drawings, there is disclosed therein at 1, a portion of a housing containing the improved lock mechanism. Such housing may be made in various shapes according to the parts to be accommodated in it. Journalled for rotative movement within the housing is a shaft 2, said shaft being mounted in a bushing 3 having a flange 35, said bushing being supported by a suitable bearing block shown at 3a. Keyed on the shaft 2 as indicated at 2a in FIG. 3, is a rotor or disk member 31 which carries a circular flange 4a provided near its peripheral edge with an arcuately shaped lug constituting a stop 4.

The sliding bolt of the lock is shown at 5 and its shape is shown in FIG. 10. Said bolt, in its fully advanced or so-called dead lock position is shown in FIG. 1. The bolt is bifurcated at one end as shown at 61 in FIG. 10 and is provided at its side edges with guide flanges 59. The latching position of the bolt and the sensing bar associated therewith, is shown in FIG. 2.

The bolt 5 is longitudinally slidable inthe housing 1 in a known manner and when it is in its fully advanced or projected position as shown in FIG. 1, this will be the .locked or bolted conditions, the bolt then entering the keeper 6 that is attached to the door frame. When the door is in this advanced position it deeply enters into the keeper and the bolt will then act as a dead bolt.

Mounted for sliding movement in the housing 1 is the sensing bar 8, the same being slidable in a longitudinal groove 36 formed in the bolt 5. The sensing bar 8 receives and is attached to in an adjustable manner, the threaded end 40 of a rod 9 which is slidably guided through the part 60 of an inner casing 22. Secured to the rod 9 is a head 41 that includes two spaced flanges or lugs shaped respectively at 12 and 13. These flanges define a spacing 14 between them and through which the arcuate lug or stop 4 can enter when the sensing bar 8 is moved to its retracted position shown in FIG. 1. The flange 13 constitutes a stop and is of arcuate form.

When the sensing bar 8 is in its extended position shown in FIG. 1, its flange 13 will lie in the path of rotative movement of the stop 4 and a torsion spring 32 surrounding the hub of the rotor 31 and spring-biasing the rotor and provided for imparting rotative movement to the rotor 31, will be restrained from acting on the rotor and the rotor will then be ineffective to cause movement of the bolt 5. At this time the end of the bolt will project about three-eighths of an inch or a relatively short distance beyond the housing and can serve as a latching member.

The torsional spring 32 has one end engaged with the rotor 31 as indicated at (FIGS. 1, 2 and 3) and its other end engages the casing 22 as indicated at 71. The spring 32 tends to impart the rotative movement to the rotor 31 when such movement is not restrained by the contact of the lug or stop 4 on the rotor with the flange 13 on the head 41. This restraining position is shown in FIGS. 2 and 5. At this time, as shown in FIG. 2, the sensing bar 8 will be projected co-extensively with the extent of projection of the bolt under the impulse of the spring 16. The extent of projection of the sensing bar 8 will be limited by the contact of the lug or stop 12 with a part 60 of the casing 22.

When it is desired to secure a full locking or bolt action from the lock, a door bearing the lock, when closed or slammed shut will bring the bolt through the aperture 45 of the striker plate and the sensing bar against the striker plate. As the sensing bar contacts the face of the striker plate it will be moved to the left, as viewed in FIG. 1, against the urge of the spring 16 to thereby move the head 41 and cause it to shift its flange 13 away from the lug or stop 4. This will permit the torsional spring 32 to rotatively move the rotor 31 which will, through coupling means connecting it to the bolt, move the bolt to its fully advanced position shown in FIG. 1.

The operation of the lock mechanism as thus far described is substantially as follows:

In FIG. 2 the bolt 5 and the sensing bar 8 are shown in the position which they assume when both of them are slightly extended out of the housing for about threeeighths of an inch in actual practice. This may be considered as the latching position. At this time the end of the sensing bar 8 lies at the forward end of the bolt 5. Also at this time, the lug or stop 13 of the sensing bar is aligned with the stop 4 on the rotor and it abuts against the stop and is held thereagainst by the action of the torsional spring 32, thus holding the rotor from turning.

When the door to which the lock is applied is swung to a closed position or is slammed shut, the bolt 5 will enter the opening in the keeper or striker plate and on its way to that position the end of the sensing bar, contacting the striker plate will be forced inwardly in the housing in opposition to the urge of the spring 16. This inward movement of the sensing bar 8 will bring the lug or stop 13 out of the path of the stop 4 so that the restraint against movement of the rotor will be removed, thus permitting the rotor to turn under the influence of the torsional spring 32. The turning movement of the rotor will cause the movement of the bolt to which it is linked, and bring the bolt to the position shown in FIG. I wherein it will be projected beyond its normally latching position or possibly for a distance of about one and one-fourth of an inch. When the bolt 5 assumes this extended position and is locked therein it acts as a dead bolt" and affords protection for locking purposes. At this time the lug or stop 13 is located to one side of the stop 4 and hence will not prevent a turning movement of the rotor necessary to move the bolt.

When it is desired to retract the bolt from its advanced or dead bolt position, the rotor 3 may be turned either by the use ofa key turned from either side of the door or by a key from the outside and a knob from the inside, this turning movement bring the stop 4 out of the path of the lug l3 and allowing the spring 16 to force the sensing bar to its extended position shown in FIG. 2.

The means for coupling the bolt 5 to the rotor to effact the sliding movement of the bolt when the rotor is turned, includes a curved or arcuate link 50 (FIG. 6) that has an aperture 51 in one end portion and which aperture fits over and is rotative on a stud 52 (FIG. 4) on the rotor. Adjacent to its opposite end the link is provided with a stud 53 that fits in an elongated slot 54 provided in a slidable coupling plate 55.

The plate or slide 55 is formed with an aperture 56 near one end and said aperture 56 engages with a stud 57 projecting from the bolt 5. Thus, as the slide 55 is moved by the action of the link 50, which movement is produced by the rotation of the rotor 31, it will be apparent that the bolt will be longitudinally shifted. A portion of the bolt is cut away as indicated at 58 in order to provide clearance for the stop 4 during the rotation of the rotor.

In FIG. 3 the parts are shown in the position of FIG. 2. That is to say, the bolt is in its fully retracted position. In FIG. 5 the sensing bar has shifted its head 41 so that the stop 4 and the lug 13 are in abutment so that the rotor is held against rotative movement. In FIG. 7 the sensing bar 8 has moved inwardly because of its contact with the striker plate 6, so that it has cleared the stop 4, permitting the rotative movement of the bolt to the fully projected dead lock position of FIG. 1.

When the bolt is in its fully projected position it cannot be retracted by force imposed on it for example by a prying element. As shown in FIG. 7, when the bolt is fully advanced the pivotal points 52 and 53 of the link 50 are beyond dead center and thus a locking effect is secured.

From the foregoing, the advantages of the improved lock mechanism will be apparent. By merely closing or slamming the door the bolt will be projected to its limit and maintained in such position until retracted by key or knob manipulation. There is thus provided in a single lock the advantages of both a latch and a dead bolt.

By the automatic extension ofthe bolt secured by the closing of the door, the possibility of the door jamb being damaged by a rigidly projecting bolt striking the jamb if the door is slammed, is avoided.

In FIGS. 13 to 18 is shown the mechanism for retracting the bolt by key operation.

Mounted against the opposite faces of the door are face plates shown respectively at 83 and 83a. Screws 82 pass through the face plates and attach them to the door. The face plates are connected by the tie rods 81. A part ofa rotor 31a which is somewhat different in shape from the rotor 31 and, which is rotative as I previously described, is apertured to receive an axle part 85 provided with a head 86. Said part 85 cooperates with a similar part 850 in forming an axle for the rotor 31.

A lock cylinder 89 contains conventional tumbler mechanism that is key-controlled and such mechanism can, if desired, be that ofthe readily changeable combination type disclosed in my US. Pat. Nos. 3,260,080 and 3,464,241.

When a key is inserted in the cylinder 89 and is turned, a cam member generally indicated at 88, and shown in detail in FIGS. 14 to 18, will by its engagement with the head 86, be moved to cause the retraction of the bolt through the movement of the rotor 31. This will cause the bolt to be retracted or moved to open" position from action taken from one side of the door.

A conical cover or cap 90 is located on the outside of a face of the door and it contains a core 91 having a sleeve 92 extending through it for the reception of the lock cylinder 89. A cup-shaped casing contained in the cap 90 has a lock ring 111 and is held in place by other securing means to be described hereinafter.

Carried by the lock mechanism contained in the cylinder 89 and moved by the turning of a proper key inserted in such mechanism, is the cam member 88. Such cam member 88 carries a projecting arcuate lug 106 (FIGS. and 16) which by its engagement with a part of the head 86 will turn the rotor 31 when the key is turned and thus retract the bolt. The cam member 88 is composed of two united sections and respectively at v 97 andn 98. The part shown at 98 has a portion that is fixedly attached to the part 97 by rivets or other fasteners 100. Said part 98 includes a slidable cam portion 980 guided in its sliding movement by pin 101 and biased by compression springs 99. The cam portion 98a constitutes a latch that normally extends behind the back of the casing 110 and thus maintains the lock cylinder from axial withdrawal or from movement toward the right as viewed in FIG. 13.

When it is desired to withdraw the lock cylinder 89 for possible repairs, adjustment or a combination change, a rod or similar elongated tool 105a is inserted through an opening 105 (FIG. 17) to thereby locate a portion of such rod in the path of rotative movement of the cam portion 98a. Then, when the parts 97, 98 are moved by the turning of a proper key in the lock mechanism of cylinder 89, the cam portion 98a will come into contact with the rod 105a and will be caused to be depressed or retracted by its contact with the rod and in opposition to the urge of the springs 99. The cam, then in the retracted position will no longer have a latching effect and since it will no longer be extended behind the back of the casing 110, the cylinder can then be withdrawn. The replacement of the cylinder or the substitution of another for the removed cylinder is simply a matter of pushing the new cylinder through the sleeve 92 so that the cam portion 98a will then spring into its advanced or latching position behind the casing 110 to hold the cylinder in place.

On the opposite face of the door is arranged the means for retracting the bolt from the second side of the door. There is shown a lock cylinder 89a which can be removably mounted in the manner described with respect to the cylinder shown at 89 or it might be otherwise disposed within the conical cap 90a. Lock cylinder 89a is provided with a key-controlled actuator 99a which engages with the part 1000 on the axle part 85a. Through this arrangement it will be apparent that the bolt may be retracted by key operation from the second side of the door. An arrangement by which the same effect can be obtained by knob operation is also possible.

In FIG. 19 some of the parts of the lock are shown in exploded or separated position in order to indicate the manner in which the cup-shaped casing 110 receives the core and its contained lock cylinder 89 and how the cup-shaped casing is moved into position for affixment to a face plate.

The face plate 83 is provided on one of its faces with a pair of projecting screw threaded studs 115 which pass through apertures 116 in the back wall 117 of the cup-shaped casing 110 and receives the round slotted nuts 1l8 to thereby attach the casing 110 to the face plate by fastening means located on the inside of the cup 110; This location of the fastening means for the cup provides for concealed securement which is not accessible from outside of the lock unless the core 91 carrying the lock cylinder is drawn out.

The rear wall 117 of the cup is apertured as at 119 to provide for the passage of the cam and latch member 88. The core 91 containing the lock cylinder 89 may thus be slid into position within the cup-shaped casing 110 and can, when desired be removed as a unit therefrom. The round nuts 118 act as guide elements for centrally locating the cam portion 98a between them when the cam member 88 isslid into position.

What I claim is:

1. In a lock mechanism, a housing, a bolt therein slidable relatively to the housing, means for normally positioning the bolt with one of its ends projecting in a first position and for a relatively short distance beyond the housing, a sensing bar arranged alongside of and contiguous to the bolt, said sensing bar being slidable relatively to the bolt and to the housing, spring means for causing the positioning of the sensing bar with one of its ends located at and adjacent to the projected end of the bolt while the bolt is in its first position, means including a spring biased rotor for slidably moving the bolt from its first position to a further projected position, co-operating stop elements on the bolt-moving means and on the sensing bar for holding the bolt moving means inoperative while the bolt and sensing bar are in the first position, one of said stop elements being an arcuate flange on the rotor, a second stop element on the sensing bar to limit outward movement thereof and the stop elements on the sensing bar being spaced flanges between which the arcuate flange passes when the sensing bar is in a retracted position, said cooperating stop means being separable to permit the advancement of the bolt by the bolt-moving means under the urge of its spring when the sensing bar is maintained in a retracted position by its contact against a door striker plate.

2. In a lock mechanism, a housing, a bolt located therein and slidable relatively to the housing, means for normally locating the bolt so that one of its ends projects for a relatively short distance beyond the housing into a first advanced position, a sensing bar arranged alongside of and contiguous to the bolt and slidable relatively to the housing and bolt, a spring-biased rotor mounted for rotative movement within the housing, a linkage connection between the rotor and the bolt whereby movement of the rotor will cause advancement of the bolt from the first advanced position to a further advanced position and for a distance' greater than the first advanced position, flanges constituting stop means carried by the sensing bar for holding the rotor against rotative movement while the bolt is in its first advanced position and while the sensing bar is advanced to an extent coextensive with and terminating at the forward end of the bolt, spring means effective on the sensing bar to force the sensing bar into such advanced first position, and means for causing movement of the sensing bar to a retracted position when it bears against a striker plate on a door frame to thereby cause the disengagement of the stop means and permit advancing bolt movement to the fully advanced position.

3. In a lock mechanism, a housing, a bolt mounted therein for sliding movement, a slide in the housing coupled to the bolt, a spring-biased rotor, a link connecting the rotor to the slide whereby rotative movement of the rotor under the urge of the spring will move the bolt to a fully advanced position in respect to the housing, the bolt having a longitudinal groove, a springbiased sensing bar slidably disposed in said groove, said sensing bar having one end disposed at the forward end of the bolt while the bolt is in a partly advanced position, the sensing bar having spaced stops at its opposite end, the rotor carrying a stop entrant in the space between the stops on the sensing bar at the time when the bar is in a retracted position, and the stop on the rotor abutting against one of the stops on the sensing bar when the sensing bar is fully advanced with its forward end terminating at the forward end of the bolt.

4. In a lock, a fixed mounting plate, a cup disposed against said plate, a filler fitted within the cup, fastening means extending from the plate and entering into the cup, said fastening means including studs bearing nuts, a lock cylinder carried by the tiller, said cylinder carrying a latch having a retractible part extended behind the base of the cup to hold the lock cylinder against displacement, the fastening means being covered and concealed by the filler and the nuts being spaced apart and located to guide parts of the latch between them when the lock cylinder has the latch inserted between said nuts.

5. In a lock mechanism, a housing, a bolt slidably mounted therein, a spring-biased rotor, a slide in the housing, a link pivoted at one end to the slide and at its other end to the rotor, the slide being pivotally attached to the bolt, a flange on the rotor, an arcuate stop projecting from a face of the flange, a slidable sensing bar arranged alongside of the bolt, a spring disposed around a part of the sensing bar and operative to urge the sensing bar to a position in which a part of it projects out of the housing in company with a part of the bolt that also projects out of the housing, the sensing bar having a projecting stop flange which, when in one position of the sensing bar, is located in the path of movement of the flange on the rotor to thereby hold the rotor against rotation while both the bolt and sensing bar are co-extensively extended out of the housing, the sensing bar having sliding movement when brought into contact with a striker plate on a door frame to bring the stop on the sensing bar out of alignment with the arcuate stop to thereby permit the rotative movement of the rotor under the urge of its spring, resulting in increased advancement of the bolt out of the hous- 

1. In a lock mechanism, a housing, a bolt therein slidable relatively to the housing, means for normally positioning the bolt with one of its ends projecting in a first position and for a Relatively short distance beyond the housing, a sensing bar arranged alongside of and contiguous to the bolt, said sensing bar being slidable relatively to the bolt and to the housing, spring means for causing the positioning of the sensing bar with one of its ends located at and adjacent to the projected end of the bolt while the bolt is in its first position, means including a spring biased rotor for slidably moving the bolt from its first position to a further projected position, co-operating stop elements on the bolt-moving means and on the sensing bar for holding the bolt moving means inoperative while the bolt and sensing bar are in the first position, one of said stop elements being an arcuate flange on the rotor, a second stop element on the sensing bar to limit outward movement thereof and the stop elements on the sensing bar being spaced flanges between which the arcuate flange passes when the sensing bar is in a retracted position, said co-operating stop means being separable to permit the advancement of the bolt by the bolt-moving means under the urge of its spring when the sensing bar is maintained in a retracted position by its contact against a door striker plate.
 2. In a lock mechanism, a housing, a bolt located therein and slidable relatively to the housing, means for normally locating the bolt so that one of its ends projects for a relatively short distance beyond the housing into a first advanced position, a sensing bar arranged alongside of and contiguous to the bolt and slidable relatively to the housing and bolt, a spring-biased rotor mounted for rotative movement within the housing, a linkage connection between the rotor and the bolt whereby movement of the rotor will cause advancement of the bolt from the first advanced position to a further advanced position and for a distance greater than the first advanced position, flanges constituting stop means carried by the sensing bar for holding the rotor against rotative movement while the bolt is in its first advanced position and while the sensing bar is advanced to an extent coextensive with and terminating at the forward end of the bolt, spring means effective on the sensing bar to force the sensing bar into such advanced first position, and means for causing movement of the sensing bar to a retracted position when it bears against a striker plate on a door frame to thereby cause the disengagement of the stop means and permit advancing bolt movement to the fully advanced position.
 3. In a lock mechanism, a housing, a bolt mounted therein for sliding movement, a slide in the housing coupled to the bolt, a spring-biased rotor, a link connecting the rotor to the slide whereby rotative movement of the rotor under the urge of the spring will move the bolt to a fully advanced position in respect to the housing, the bolt having a longitudinal groove, a spring-biased sensing bar slidably disposed in said groove, said sensing bar having one end disposed at the forward end of the bolt while the bolt is in a partly advanced position, the sensing bar having spaced stops at its opposite end, the rotor carrying a stop entrant in the space between the stops on the sensing bar at the time when the bar is in a retracted position, and the stop on the rotor abutting against one of the stops on the sensing bar when the sensing bar is fully advanced with its forward end terminating at the forward end of the bolt.
 4. In a lock, a fixed mounting plate, a cup disposed against said plate, a filler fitted within the cup, fastening means extending from the plate and entering into the cup, said fastening means including studs bearing nuts, a lock cylinder carried by the filler, said cylinder carrying a latch having a retractible part extended behind the base of the cup to hold the lock cylinder against displacement, the fastening means being covered and concealed by the filler and the nuts being spaced apart and located to guide parts of the latch between them when the lock cylinder has the latch inserted between said nutS.
 5. In a lock mechanism, a housing, a bolt slidably mounted therein, a spring-biased rotor, a slide in the housing, a link pivoted at one end to the slide and at its other end to the rotor, the slide being pivotally attached to the bolt, a flange on the rotor, an arcuate stop projecting from a face of the flange, a slidable sensing bar arranged alongside of the bolt, a spring disposed around a part of the sensing bar and operative to urge the sensing bar to a position in which a part of it projects out of the housing in company with a part of the bolt that also projects out of the housing, the sensing bar having a projecting stop flange which, when in one position of the sensing bar, is located in the path of movement of the flange on the rotor to thereby hold the rotor against rotation while both the bolt and sensing bar are co-extensively extended out of the housing, the sensing bar having sliding movement when brought into contact with a striker plate on a door frame to bring the stop on the sensing bar out of alignment with the arcuate stop to thereby permit the rotative movement of the rotor under the urge of its spring, resulting in increased advancement of the bolt out of the housing. 